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This will be used for CUDA where we need to link with vendor-supplied bitcode library and with a bitcode library pretending to be libm for GPUs.
Linking options for particular file depend on the option that specifies the file.
Currently there are two:
* -mlink-bitcode-file links in complete content of the specified file.
* -mlink-cuda-bitcode links in only the symbols needed by current TU.
Linked symbols are internalized. This bitcode linking mode is used to
link device-specific bitcode provided by CUDA.
Files are linked in order they are specified on command line.
-mlink-cuda-bitcode replaces -fcuda-uses-libdevice flag.
http://reviews.llvm.org/D13913
Files:
include/clang/Basic/LangOptions.def
include/clang/CodeGen/CodeGenAction.h
include/clang/Driver/CC1Options.td
include/clang/Frontend/CodeGenOptions.h
lib/CodeGen/CodeGenAction.cpp
lib/Frontend/CompilerInvocation.cpp
test/CodeGen/link-bitcode-file.c
test/CodeGenCUDA/Inputs/device-code-2.ll
test/CodeGenCUDA/link-device-bitcode.cu
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